Congrats on getting this one, this is the main character and -judging on what you got- you make a great leader, your imagination is wild and you're a great friend to have!
Not much is known about Sapphire's personality at this time, but it is very clear that she is very compassionate and level-headed. She seems to balance out Ruby's more impulsive personality when they're fused as Garnet. She's shown to hold some intelligence, as she came to the conclusion that Steven was immune to the force field, due to his half-human side almost immediately. -From Steven Universe Wikia